you might want to have a look at several statistics, such as the the OECD better life index: http://www.oecdbetterlifeindex.org/
eurostat has some good statistics on the average rating on satisfaction.
How do you define sustainable marketing? This is important, because there are several definitions and the answer to your quastion depends on, what's your understanding of sustainable Marketing.
Sustainable marketing calls for socially and environmentally responsible actions that meet the present needs of consumers and businesses while also preserving or enhancing the ability of future generations to meet their needs.